First, for dynamic C/C++ libraries like OpenSSL, some degree of symbols have to be maintained in order to relocate the library and find the entry point to the corresponding function.
Second, Objective-C is a dynamic language and as such the binary will always include the Objective-C method names. The reason is that they are resolved at runtime (via so-called "selectors"). In fact, Objective-C doesn't technically call methods but they use a message passing system. So if you pull any app from the app store, you can determine all classes, methods, and mostly arguments of the methods.
Comments
Wouldn't it be much harder to patch the binary if it were stripped? Is it not common to strip release builds of iOS apps?
(Disclaimer: I'm the author of the blog post)
I think, there is two things to that.
First, for dynamic C/C++ libraries like OpenSSL, some degree of symbols have to be maintained in order to relocate the library and find the entry point to the corresponding function.
Second, Objective-C is a dynamic language and as such the binary will always include the Objective-C method names. The reason is that they are resolved at runtime (via so-called "selectors"). In fact, Objective-C doesn't technically call methods but they use a message passing system. So if you pull any app from the app store, you can determine all classes, methods, and mostly arguments of the methods.